US3677671A - Apparatus for forming helical gear wheel bodies from powder - Google Patents

Apparatus for forming helical gear wheel bodies from powder Download PDF

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Publication number
US3677671A
US3677671A US7864A US3677671DA US3677671A US 3677671 A US3677671 A US 3677671A US 7864 A US7864 A US 7864A US 3677671D A US3677671D A US 3677671DA US 3677671 A US3677671 A US 3677671A
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US
United States
Prior art keywords
die
lower punch
punch
gear wheel
bolster
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US7864A
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English (en)
Inventor
Anthony Michael Martin
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Individual
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Individual
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Publication of US3677671A publication Critical patent/US3677671A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • B22F5/085—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs with helical contours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • This invention relates to an apparatus for forming helical gear wheel bodies by compacting initially powdery materials in dies by pressure between two punches.
  • the present invention is therefore intended to provide an improved apparatus for forming helical gear wheel bodies by compacting initially powdery materials in dies by pressure between two punches.
  • the invention comprises the provision of apparatus for effecting a method of fomiing a gear wheel body with helical teeth, comprising in combination a die and two punches between which the material is pressed and compacted in the die, characterized in that the said die has a female mould cavity with helical grooves for the formation of said helical teeth, that at least one of the said two punches is of male helicallytoothed form to match the said mould cavity and is arranged to move axially within and relatively to the die during the compaction of the material and during the ejection of the formed gear wheel body from the die, and that the apparatus further comprises a hydraulic or pneumatic system including sensing means and drive means such that the said one punch is positively driven in rotation relative to the die and that the said rotation is compatible and proportional with respect to the axial movement of the said one punch within and relative to the die and with the male helically-Toothed form of the said one punch fitting and matching in the said mouldcav
  • the apparatus comprises the said helically-grooved die, an upper punch, a lower helically-toothed punch adapted to enter said die with axial and rotational motion relative to the die, a powder-compacting press rig including said die and said upper punch and said lower punch, and the said hydraulic or pneumatic system whereby the lower punch is positively driven in rotation as above specified.
  • the said hydraulic or pneumatic system preferably comprises or consists substantially of the components of a standard lathe copying attachment.
  • the said one punch is shaped so that the gear wheel body and the said one punch are formed with inter-engaging projections and recesses whereby during ejection from the die the gear wheel body is positively driven in rotation by and in unison with the said one punch relative to the die.
  • the apparatus comprises an internally helically-grooved die 1 in which the bore is fashioned to produce a female mould cavity with helical grooves for the formation of a gear wheel body with helical teeth. If material initially in the form of metal powder is suitably compacted within such a die, the product will be .a male gear wheel body B with helical teeth.
  • the die 1 is clamped securely within a die bolster 2 by means of a clamping ring 15 and screws 16.
  • Shown entered into the die 1 are a lower punch 3 and an upper punch 14, each of which has a male external helical gear form to match the female helical gear form mould cavity in the die 1.
  • the material has been compacted by pressure between the two punches 3 and 14 to form the gear wheel body B.
  • the lower punch 3 On the lower punch 3 is an integral or rigidly-secured coaxial gear wheel 3A with an external plain gear form.
  • the lower punch 3 with its gear wheel 3A is supported on a lower punch support plate 4, which in turn is guided and supported on its periphery by a ball-bearing l7 and further supported by a thrust ball-bearing 5 carried on a lower punch adaptor 6, which is secured to a lower punch support plate or a lower press ram 7 of a substantially conventional powder-compacting press rig.
  • a bracket 8 Situated on the underside of the die bolster 2 is a bracket 8, carrying a template or cam 9, which is preformed with a contour suited to control the rotations of the lower punch 3 during the operations of the apparatus.
  • a slave cylinder 10 Mounted in the vicinity of the template or cam 9 is a slave cylinder 10 of a standard lathe copying attachment.
  • a probe or stylus 10A of the cylinder 10 engages the template or earn 9. It is well known in the engineen'ng world that so-called lathe copying can be easily achieved by the use of a slave cylinder having a probe or stylus which follows the profile of a template or cam or a specimen component which is used as a master in conformity with which other components are to be manufactured.
  • a hydraulic or pneumatic system is connected by pipes to a conventional master pumping unit (not shown, but indicated by a chain-dotted line) from which is hydraulically or pneumatically pumped power to a main cylinder ll of the lathe copying attachment.
  • a master pumping unit not shown, but indicated by a chain-dotted line
  • a toothed rack 12 with plain gear-form teeth which, by the movements of the rack 12, will rotate the lower punch 3, by the meshing of the rack 12 with the pinion or gear wheel 3A formed on the lower portion of the lower punch 3.
  • the cylinder 10 is mounted in fixed relationship to the lower punch support plate or lower press ram 7, and the template or cam 9 and the hydraulic or pneumatic system are such that the lower punch 3 is positively driven in rotation proportionally to its axial motion relative to the die 1 and in correct relau'onship to the helical formation of the meshing helical grooves and teeth during the compaction and ejection operations.
  • a top punch For many shapes of helical gear wheel bodies, for example were the depth of powder fill is comparatively shallow and the required body is fairly thin, there is no requirement that a top punch should enter the die 1 at any time, and it is sufficient if the top of the die 1 is closed (after filling with powder) with a solid flat-bottomed top or upper punch (not shown) which covers the die upper orifice and prevents powder from being ejected from the die 1 during the movements of the lower punch 3 and/or the die 1 during compaction.
  • an upper punch 14 with an external helical gear formation such that the upper punch 14 is capable of entering and fitting into the die 1.
  • the upper punch 14 is suitably positively driven in rotation in relation to the die 1 like the lower punch 3, the positive rotation of the upper punch 14 being achieved with a separate or second set of slave and main cylinders of a separate or second lathe copying attachment (not shown).
  • the die 1 could be positively rotated in a somewhat similar manner to that used for the bottom punch 3 by using a separate second or third slave cylinder and main cylinder of a second or third separate lathe copying attachment (not shown).
  • the apparatus according to the invention can be used.
  • apparatus can be used, the die and/or the upper punch being positively driven in rotation relative to the fixed lower punch.
  • Each compacted helical gear wheel body is preferably positively driven in rotation relative to the die 1 during ejection in unison with and by one or both of the punches by forming the gear wheel body and the lower punch and/or the upper punch with inter-engaging means such as projections and recesses.
  • an apparatus for compacting initially powdery material to form gear wheel bodies with helical teeth including a powder-compacting press rig having a die bolster, a die having a cavity with a helical groove therein secured in said die bolster, a lower unch support below said die bolster, a rotatable lower puncli mounte on said lower punch support and having a helically-toothed form and extending into and matching with said cavity and helical groove therein, a gear wheel rigid with said lower punch and mechanism for effecting relative rotational motion of said die bolster and said lower punch support for relative axial motions of said die and said lower punch in the axial direction of said lower punch, the improvement comprising that said punch-rotating means includes a cam secured to said die bolster, a hydraulic slave cylinder mounted in fixed relationship to said lower punch support, a slave piston in said slave cylinder, a cam-follower stylus secured to said slave piston and engaging said cam, a main hydraulic cylinder mounted in fixed relationship to said lower punch support,
  • the apparatus as recited in claim 1 further including a second punch with an external helical gear formation including an upper punch supported and rotated with respect to said die bolster by means identical to which said lower punch is supported and rotated with respect to said die bolster.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Forging (AREA)
US7864A 1969-02-01 1970-02-02 Apparatus for forming helical gear wheel bodies from powder Expired - Lifetime US3677671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB555969 1969-02-01

Publications (1)

Publication Number Publication Date
US3677671A true US3677671A (en) 1972-07-18

Family

ID=9798409

Family Applications (1)

Application Number Title Priority Date Filing Date
US7864A Expired - Lifetime US3677671A (en) 1969-02-01 1970-02-02 Apparatus for forming helical gear wheel bodies from powder

Country Status (8)

Country Link
US (1) US3677671A (xx)
BE (1) BE745197A (xx)
CH (1) CH511083A (xx)
DE (1) DE2002684C3 (xx)
ES (1) ES375894A1 (xx)
FR (1) FR2032665A5 (xx)
GB (1) GB1226889A (xx)
SE (1) SE364200B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909167A (en) * 1972-12-29 1975-09-30 C Olivetti & C S P A Ufficio B Apparatus for moulding helical parts by compacting powdered materials
US5366363A (en) * 1991-08-17 1994-11-22 Werkzeugbau Alvier Ag Modular apparatus for compression forming or calibrating of powder metal workpieces
US20140314899A1 (en) * 2009-12-18 2014-10-23 Nestec Sa High pressure relief assembly and assembly locking device for use with extruders
CN105555441A (zh) * 2013-09-30 2016-05-04 山高刀具公司 制作具有螺旋排屑槽的切削刀具生坯的压机和制作具有螺旋排屑槽的切削刀具生坯的方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2320336B2 (de) * 1973-04-21 1980-02-21 Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover Vorrichtung zur spanlosen Herstellung von Kegelzahnrädern aus Metallrohteilen
FR2490515B1 (xx) * 1980-09-22 1982-09-03 Alliages Frittes Sa
JPS61245923A (ja) * 1985-04-22 1986-11-01 Masao Murakawa はす歯歯車類製造用プレス
JP3031647B2 (ja) * 1992-02-08 2000-04-10 日立粉末冶金株式会社 粉末材料の押出し成形装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1958199A (en) * 1932-02-16 1934-05-08 Doehler Die Casting Co Die-casting machine
US2404631A (en) * 1944-02-09 1946-07-23 Mack Molding Company Inc Molding die and means for removing molded articles therefrom
US2561735A (en) * 1949-07-21 1951-07-24 Haller John Machine for molding helical gears
US3394432A (en) * 1963-12-18 1968-07-30 R Laurent Sa Atel Apparatus for the production of helically toothed mechanical parts from sintered metals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1958199A (en) * 1932-02-16 1934-05-08 Doehler Die Casting Co Die-casting machine
US2404631A (en) * 1944-02-09 1946-07-23 Mack Molding Company Inc Molding die and means for removing molded articles therefrom
US2561735A (en) * 1949-07-21 1951-07-24 Haller John Machine for molding helical gears
US3394432A (en) * 1963-12-18 1968-07-30 R Laurent Sa Atel Apparatus for the production of helically toothed mechanical parts from sintered metals

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909167A (en) * 1972-12-29 1975-09-30 C Olivetti & C S P A Ufficio B Apparatus for moulding helical parts by compacting powdered materials
US5366363A (en) * 1991-08-17 1994-11-22 Werkzeugbau Alvier Ag Modular apparatus for compression forming or calibrating of powder metal workpieces
US20140314899A1 (en) * 2009-12-18 2014-10-23 Nestec Sa High pressure relief assembly and assembly locking device for use with extruders
US9718231B2 (en) * 2009-12-18 2017-08-01 Nestec Sa High pressure relief assembly and assembly locking device for use with extruders
CN105555441A (zh) * 2013-09-30 2016-05-04 山高刀具公司 制作具有螺旋排屑槽的切削刀具生坯的压机和制作具有螺旋排屑槽的切削刀具生坯的方法
US20160229082A1 (en) * 2013-09-30 2016-08-11 Seco Tools Ab Press for making a cutting tool green body having a helical flute, and method for making a cutting tool green body having a helical flute
US9962856B2 (en) * 2013-09-30 2018-05-08 Seco Tools Ab Press for making a cutting tool green body having a helical flute, and method for making a cutting tool green body having a helical flute

Also Published As

Publication number Publication date
DE2002684B2 (de) 1973-12-06
CH511083A (de) 1971-08-15
SE364200B (xx) 1974-02-18
FR2032665A5 (xx) 1970-11-27
BE745197A (fr) 1970-07-01
DE2002684C3 (de) 1974-07-04
ES375894A1 (es) 1972-11-01
DE2002684A1 (de) 1970-09-03
GB1226889A (xx) 1971-03-31

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